Mikuni Carbs - XJ600S 1991

[boink1079]

I have ripped off the carbs on my Yammy to find that they are Mikuni's and have been a bit roughed up by the last owner.

Has anyone replaced carbs on their bikes? If so, what did you go with? I would prefer non genuine as it appears as the parts costs have gone up (I refer to other threads on carbs)

I have measured the throat - to the manifold diameter - it is 28mm inside diameter.

Craig

[boink1079]

Scratch that - I'll stay with the mikuni carbs - but I have a prob. I have a 1992 onwards service manual and my bike is a 1991. the carbs looked the same in the manual as on the bike but as soon as i opened the float cover - the difference is there. I have been looking for a way to identify the cabs but no model on them. Any one assist?

[Padster]

The very early Divvy 6 models have different carbs and a vacuum rather than electric fuel pump. Both types of carb are shown in the Haynes manual.

[sotirisp]

boink

you are right.

Haynes manual shows a different version of carbs (those with metal caps on the diaphragms).

and yes those appearing in the Haynes manuals have different floats.

I suspect that the pictures are from a Seca II (American version of Diversion).

It's not a year matter - i'm sure that European Diversion 600 '91 and '92 have exactly the same carbs.

What exactly do you want to do with your carbs? Maybe i can advise ...

[boink1079]

sotirisp,

Cheers for the reply. The xj600 is lacking power low down and also "surges" on the power with the clutch right out. I have cleaned some of the carbs and it has helped - I have not yet balanced them - will do by the end of the week.

Essentially, I want to fully clean and replace "o" rings, jets, etc. I am not yet willing to as the manual deviates and I am a newbie when it comes to carbs.

The bike is a compliance plate of 10/91, has a electronic fuel pump and I would say that is a UK 1992 model.

Any advice would be good - tips etc.

Craig

[shan]

On the bike, on the left side is a label. It shows the model of bike. I think it help to find the right carbs.
I have the Divvy 6 '92 and the same mikuni 28 mm carbs.

[sotirisp]

boink

i think a synchronization will fix most of your performance problems.

But a cleaning of the carbs is also always welcome. Assuming that your valve clearances are within specs...

if your "fully clean" means dissasembly of the carbs and dunking them in a bath of carb cleaner, then it's a somewhat difficult job (at least to me).

I plan to do this in due time but i still try to figure out the whole process of taking apart the carbs, remove ALL plastic and rubber pieces and dunk 'em.

Alternatively you could use some carb cleaner spray and clean individual parts like the jets, bowls, passages, while replacing damaged o-rings anywhere you find 'em...WITHOUT separating the carbs or completely remove any plastic or rubber o-rings.

You definitely HAVE to remove the diaphragms and floats though. They 're sensitive to carb solvents and you don't want to risk damaging 'em (expensive parts).

BUT this may or may not have the results you expect, depends on the overall condition of your carbs (how dirty they are).

I currently experience a new problem with my divvy, one cylinder doesn't work at idle (works fine when i open the throttle) , and from what i understand the relative carb's slow circuit passages are clogged somewhere and spray wasn't able to fix that...

I plan to bath the carbs into cleaner solvent and get rid of the problem once and for all (i hope).